CT scanning system parameter determination method, device, equipment and medium

Abstract

The CT scanning system parameter determination method, device, equipment and medium provided by the embodiments of the present disclosure include: constructing a body shape distribution function of a scanning phantom and a body shape distribution function in a scanning direction; obtaining preset parameter information of the CT scanning system; determining a tube current modulation dose function according to a preset scanning phantom equivalent diameter, a preset pitch reference parameter, a preset current time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, a scanning gantry rotation period, the linear attenuation coefficient of the water, a body shape differentiation adjustment factor, a body shape distribution function and a scanning direction body shape distribution function; determining a pitch position function according to the preset pitch reference parameter, the linear attenuation coefficient of water and the scanning direction body shape distribution function; determining a target tube current modulation dose and a target pitch at a target scanning angle and a target scanning position according to the tube current modulation dose function and the pitch position function, so as to improve the quality of the scanned image.

Description

Technical Field

[0001] The present invention relates to the field of CT scanning technology and related technical fields, and in particular to a method, device, equipment and storage medium suitable for determining parameters of a CT scanning system. Background Art

[0002] Spiral scanning is an important scanning mode in CT applications, in which pitch is an important parameter of spiral scanning. The size of the pitch determines the speed of scanning. Large and small pitches correspond to clinical applications in different scenarios. Small pitches are used for tissues with high diagnostic requirements, and large pitches are used for tissues that require fast and wide-range scanning. With the gradual increase in clinical application requirements, spiral scanning provides a variable pitch scanning mode. In the variable pitch scanning scenario, you can freely switch between large and small pitches according to the plan.

[0003] In the variable pitch spiral scanning mode, in order to ensure that the image quality consistency along the pitch change direction meets the requirements, different doses (tube current or milliamperes) need to be used for different pitch positions. The dose modulation (also called tube current modulation or milliampere modulation) function that is more commonly used in the traditional spiral scanning mode also requires differentiated control of the dose. This causes a fundamental conflict between the two (variable pitch and dose modulation) in the control of the dose, resulting in poor image consistency under variable pitch spiral scanning. Summary of the invention

[0004] The embodiments described herein provide a method, apparatus, device and storage medium for determining parameters of a CT scanning system, which solve the problems existing in the prior art.

[0005] In a first aspect, according to the present disclosure, a method for determining parameters of a CT scanning system is provided, comprising:

[0006] Constructing the body shape distribution function of the scanning model and the body shape distribution function of the scanning direction;

[0007] Acquiring preset parameter information of the CT scanning system, wherein the preset parameter information includes a preset scanning phantom equivalent diameter, a preset pitch reference parameter, a preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, a scanning gantry rotation period, a linear attenuation coefficient of water, and a body shape differentiation adjustment factor;

[0008] Determine a tube current modulation dose function according to the preset scanning phantom equivalent diameter, the preset pitch reference parameter, the preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, the scanning gantry rotation period, the linear attenuation coefficient of water, the body shape difference adjustment factor, the body shape distribution function and the scanning direction body shape distribution function;

[0009] Determining a pitch position function according to the preset pitch reference parameter, the linear attenuation coefficient of water and the scanning direction body shape distribution function;

[0010] A target tube current modulation dose and a target helical pitch at a target scanning angle and a target scanning position are determined according to the tube current modulation dose function and the helical pitch position function.

[0011] In some embodiments of the present disclosure, the body shape distribution position function satisfies:

[0012]

[0013] The scanning direction body shape distribution function satisfies:

[0014]

[0015] Where z is the scanning position of the scanning bed, θ is the rotation angle of the scanning gantry, and D l (z) is the equivalent long axis information of the scanned phantom when the scanning position of the scanning bed is z in the scanning direction of the scanning bed, D s (z) is the equivalent short-axis information of the scanning phantom when the scanning position of the scanning bed is z in the scanning direction of the scanning bed.

[0016] In some embodiments of the present disclosure, the tube current modulation dose function satisfies:

[0017] mA(z,θ)=mAs ref *Pitch ref *exp[mu*(WED-WED ref )*Coe]*exp[mu*(width(z,θ)-WED(z))] / RT

[0018] Where z is the scanning position of the scanning bed, θ is the rotation angle of the scanning gantry, and WED ref Pitch is the preset equivalent diameter of the scanning model. ref is the preset pitch reference parameter, mAs ref is the preset current-time product under the preset scanning phantom equivalent diameter and preset pitch reference parameters, RT is the scanning gantry rotation period, mu is the linear attenuation coefficient of water, and Coe is the body shape difference adjustment factor.

[0019] In some embodiments of the present disclosure, the pitch position function satisfies:

[0020]

[0021] Among them, Pitch ref is the preset pitch reference parameter, and mu is the linear attenuation coefficient of water.

[0022] In some embodiments of the present disclosure, before determining the tube current modulation dose function according to the body shape distribution position function and the scanning direction body shape distribution function, the method further includes:

[0023] In response to receiving a scanning operation submitted by the target object, acquiring a positioning scanning image of the scanning phantom;

[0024] Determining scanning information according to the positioning scanning image, wherein the scanning information includes a starting scanning position and an ending scanning position;

[0025] The scanning information is introduced into the scanning direction body shape distribution function to determine the average equivalent diameter of the scanning phantom.

[0026] In some embodiments of the present disclosure, determining a target tube current modulation dose and a target pitch at a target scanning angle and a target scanning position according to the tube current modulation dose function and the pitch position function comprises:

[0027] Obtaining a target scanning angle of a scanning gantry and a target scanning position of a scanning bed;

[0028] Substituting the target scanning angle and the target scanning position into the tube current modulation dose function to obtain a target tube current modulation dose at the target scanning angle and the target scanning position;

[0029] The target scanning position is brought into the pitch position function to obtain the target pitch at the target scanning position.

[0030] In some embodiments of the present disclosure, the method further includes:

[0031] Controlling the tube current modulation dose of the CT scanning system to be the target tube current modulation dose at the target scanning position and the target scanning angle;

[0032] The pitch of the CT scanning system is controlled to be the target pitch at the target scanning position.

[0033] In a second aspect, according to the present disclosure, a device for determining parameters of a CT scanning system is provided, comprising:

[0034] A distribution function construction module is used to construct a body shape distribution function of the scanning model and a body shape distribution function in the scanning direction;

[0035] A preset parameter information acquisition module, used to acquire preset parameter information of a CT scanning system, wherein the preset parameter information includes a preset scanning phantom equivalent diameter, a preset pitch reference parameter, a preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, a scanning gantry rotation period, a linear attenuation coefficient of water, and a body shape differentiation adjustment factor;

[0036] a tube current modulation dose function determination module, configured to determine a tube current modulation dose function according to the preset scanning phantom equivalent diameter, the preset pitch reference parameter, the preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, the scanning gantry rotation period, the linear attenuation coefficient of water, the body shape difference adjustment factor, the body shape distribution function and the scanning direction body shape distribution function;

[0037] A pitch position function determination module, used to determine the pitch position function according to the preset pitch reference parameter, the linear attenuation coefficient of the water and the body shape distribution function in the scanning direction;

[0038] The target parameter determination module is used to determine a target tube current modulation dose and a target pitch at a target scanning angle and a target scanning position according to the tube current modulation dose function and the pitch position function.

[0039] In a third aspect, according to the present disclosure, there is provided a computer device, including:

[0040] one or more processors;

[0041] a storage device for storing one or more programs,

[0042] When the one or more programs are executed by the one or more processors, the one or more processors implement any method as described in the first aspect.

[0043] In a fourth aspect, according to the content of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, it implements any method as described in the first aspect.

[0044] The CT scanning system parameter determination method, device, equipment and medium provided by the embodiments of the present disclosure first construct a body shape distribution function of a scanning phantom and a body shape distribution function in a scanning direction; then obtain preset parameter information of the CT scanning system; and then determine a tube current modulation dose function according to a preset scanning phantom equivalent diameter, a preset pitch reference parameter, a preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, a scanning gantry rotation period, a linear attenuation coefficient of water, a body shape differentiation adjustment factor, a body shape distribution function and a body shape distribution function in a scanning direction; and determine a pitch position function according to the preset pitch reference parameter, the linear attenuation coefficient of water and the body shape distribution function in the scanning direction; finally, determine a target tube current modulation dose and a target pitch at a target scanning angle and a target scanning position according to the tube current modulation dose function and the pitch position function. That is, the target tube current modulation dose at the target scanning angle and the target scanning position is determined by the tube current modulation dose function, and the target pitch at the target scanning position is determined based on the pitch position function, and the tube current modulation dose function is determined based on the body shape distribution function and the scanning direction body shape distribution function. Therefore, the tube current modulation dose function can better reflect the body shape distribution of the scanning model at different scanning positions and scanning angles. When the scanning bed moves to different scanning positions and scanning angles, the adaptive tube current modulation dose of the normalized dose can be better calculated based on the tube current modulation dose function, and the pitch position function reflects the determination based on the scanning direction body shape distribution function. Therefore, when the scanning bed moves to different scanning positions, the adaptive pitch of the normalized dose can be better calculated based on the pitch position function, and the noise difference problem caused by the difference in the distribution of the scanning model's body shape distribution along the scanning direction of the scanning bed can be better eliminated.

[0045] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below. It should be noted that the drawings described below only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure, wherein:

[0047] Figure 1 is a flow chart of a method for determining parameters of a CT scanning system provided by an embodiment of the present disclosure;

[0048] Figure 2 is a structural schematic diagram of a device for determining parameters of a CT scanning system provided by an embodiment of the present disclosure;

[0049] Figure 3 It is a structural diagram of a computer device provided in an embodiment of the present disclosure.

[0050] In the drawings, reference numerals with the same last two digits correspond to the same elements. It should be noted that the elements in the drawings are schematic and not drawn to scale. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative work also fall within the scope of protection of the present disclosure.

[0052] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by a person skilled in the art to which the subject matter of the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the specification and the relevant art, and will not be interpreted in an idealized or overly formal form unless otherwise explicitly defined herein. As used herein, a statement that two or more parts are "connected" or "coupled" together shall mean that the parts are joined together directly or through one or more intermediate components.

[0053] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0055] Furthermore, in all embodiments of the present disclosure, terms such as “first” and “second” are used only to distinguish one component (or a part of a component) from another component (or another part of a component).

[0056] In the description of the present application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two).

[0057] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0058] Based on the problems existing in the prior art, the present disclosure provides a method for determining parameters of a CT scanning system. Figure 1 is a flow chart of a method for determining parameters of a CT scanning system provided by an embodiment of the present disclosure, such as Figure 1 As shown, the specific process of the method for determining the parameters of the CT scanning system includes:

[0059] S110, constructing a body shape distribution function of the scanning phantom and a body shape distribution function in the scanning direction.

[0060] Specifically, at any rotation angle and scanning position, the human body cross section of the scanning phantom can be approximately elliptical. According to the long axis information and short axis information of the human body cross section, the body shape distribution of the scanning phantom can be determined. For example, when the light source of the CT scanning system is located directly above the scanning bed, the long axis information of the human body cross section reflects the width information of the human body, and the short axis information of the human body cross section reflects the thickness information of the human body, or the long axis information of the human body cross section reflects the thickness information of the human body, and the short axis information of the human body cross section reflects the width information of the human body. Therefore, in the CT scanning system parameter determination method provided in the embodiment of the present disclosure, the body shape distribution function of the scanning phantom is first constructed.

[0061] Specifically, the body shape distribution function of the scanned phantom satisfies:

[0062]

[0063] Where z is the scanning position of the scanning bed, θ is the rotation angle of the scanning gantry, and D l (z) is the equivalent long axis information of the scanned phantom when the scanning position of the scanning bed is z in the scanning direction of the scanning bed, D s (z) is the equivalent short-axis information of the scanning phantom when the scanning position of the scanning bed is z in the scanning direction of the scanning bed.

[0064] The equivalent long-axis information and the equivalent short-axis information of the scanning phantom at different scanning positions in the scanning direction of the scanning bed are determined according to the positioning scanning image.

[0065] Specifically, the scanning direction of the scanning bed is the direction in which the scanning bed moves in, that is, the Z direction, that is, the D direction. l(z) is the equivalent long axis information of the scanning phantom obtained at different scanning positions of the scanning bed when the line connecting the light source and the detector module is perpendicular to the direction of the scanning bed. s (z) is the equivalent short-axis information of the scanning phantom obtained at different scanning positions of the scanning bed when the line connecting the light source and the detector module is perpendicular to the direction in which the scanning bed moves.

[0066] When the scanning gantry rotation angle θ and the scanning bed scanning position z are determined, the size distribution of the scanning phantom at the scanning gantry rotation angle θ and the scanning bed scanning position z can be determined according to the size distribution function of the scanning phantom.

[0067] In addition, by constructing the body shape distribution function in the scanning direction, the body shape distribution of the scanning phantom in the scanning direction is determined according to the long axis information and short sleeve information of the human cross section obtained at different scanning positions (the rotation angle of the rotating frame is that the line connecting the light source and the detector module is perpendicular to the direction of entry of the scanning bed).

[0068] Specifically, the body shape distribution function in the scanning direction satisfies:

[0069]

[0070] Where z is the scanning position of the scanning bed, D l (z) is the equivalent long axis information of the scanned phantom when the scanning position of the scanning bed is z in the scanning direction of the scanning bed, D s (z) is the equivalent short-axis information of the scanning phantom when the scanning position of the scanning bed is z in the scanning direction of the scanning bed.

[0071] S120: Obtain preset parameter information of the CT scanning system.

[0072] Among them, the preset parameter information includes a preset scanning phantom equivalent diameter, a preset pitch reference parameter, a preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, a scanning gantry rotation period, a linear attenuation coefficient of water, and a body shape differentiation adjustment factor.

[0073] In a specific implementation, in the CT scanning system parameter determination method provided in the embodiment of the present disclosure, the preset parameter information of the CT scanning system is pre-set. When the target object triggers the scanning operation, the preset parameter information of the CT scanning system is first obtained, and the tube current modulation dose function of the subsequent step S130 and the pitch position function of the step S140 are constructed through the parameter information, thereby laying a foundation for determining the target tube current modulation dose and the target pitch in the subsequent scanning process.

[0074] Among them, WED ref To preset the equivalent diameter and Pitch of the scanning model ref is the preset pitch reference parameter, mAsref is the preset current-time product under the preset scanning phantom equivalent diameter and preset pitch reference parameters, RT is the scanning gantry rotation period, mu is the linear attenuation coefficient of water, and Coe is the body shape differentiation adjustment factor.

[0075] S130, determining a tube current modulation dose function according to a preset scanning phantom equivalent diameter, a preset pitch reference parameter, a preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, a scanning gantry rotation period, a linear attenuation coefficient of water, the body shape differentiation adjustment factor, a body shape distribution function, and a scanning direction body shape distribution function.

[0076] Specifically, according to a preset scanning phantom equivalent diameter, a preset current-time product under the preset scanning phantom equivalent diameter and preset pitch reference parameters, a scanning gantry rotation period, a linear attenuation coefficient of water, the body shape difference adjustment factor, a body shape distribution function, and a scanning direction body shape distribution function, the determined tube current modulation dose function satisfies:

[0077] mA(z,θ)=mAs ref *Pitch ref *exp[mu*(WED-WEDref)*Coe]*exp[mu*(width(z,θ)-WED(z))] / RT

[0078] S140, determining a pitch position function according to a preset pitch reference parameter, a linear attenuation coefficient of water, and a body shape distribution function in a scanning direction.

[0079] Specifically, according to the preset pitch reference parameter, the linear attenuation coefficient of water and the body shape distribution function in the scanning direction, the pitch position function is determined to satisfy:

[0080]

[0081] S150, determining a target tube current modulation dose and a target pitch at a target scanning angle and a target scanning position according to the tube current modulation dose function and the pitch position function.

[0082] In a specific embodiment, a target tube current modulation dose and a target helical pitch at a target scanning angle and a target scanning position are determined according to a tube current modulation dose function and a pitch position function, including: acquiring a target scanning angle of a scanning gantry and a target scanning position of a scanning bed; bringing the target scanning angle and the target scanning position into the tube current modulation dose function to obtain a target tube current modulation dose at the target scanning angle and the target scanning position; bringing the target scanning position into the pitch position function to obtain a target helical pitch at the target scanning position.

[0083] After the tube current modulation dose function and the pitch position function are determined, the CT scanning system, during the scanning process, brings the scanning angle and scanning position into the tube current modulation dose function according to the acquired scanning angle of the rotating gantry and the scanning position of the scanning bed, and can determine the tube current modulation dose at the scanning angle and scanning position. And bringing the scanning position into the pitch position function can determine the pitch at the scanning position.

[0084] In the CT scanning system parameter determination method provided by the embodiment of the present disclosure, firstly, a body shape distribution function of a scanning phantom and a body shape distribution function in a scanning direction are constructed; then, preset parameter information of the CT scanning system is obtained; and then, according to a preset scanning phantom equivalent diameter, a preset pitch reference parameter, a preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, a scanning gantry rotation period, a linear attenuation coefficient of water, a body shape differentiation adjustment factor, a body shape distribution function and a scanning direction body shape distribution function, a tube current modulation dose function is determined; and according to the preset pitch reference parameter, the linear attenuation coefficient of water and the body shape distribution function in the scanning direction, a pitch position function is determined; finally, according to the tube current modulation dose function and the pitch position function, a target tube current modulation dose and a target pitch at a target scanning angle and a target scanning position are determined. That is, the target tube current modulation dose at the target scanning angle and the target scanning position is determined by the tube current modulation dose function, and the target pitch at the target scanning position is determined based on the pitch position function, and the tube current modulation dose function is determined based on the body shape distribution function and the scanning direction body shape distribution function. Therefore, the tube current modulation dose function can better reflect the body shape distribution of the scanning model at different scanning positions and scanning angles. When the scanning bed moves to different scanning positions and scanning angles, the adaptive tube current modulation dose of the normalized dose can be better calculated based on the tube current modulation dose function, and the pitch position function reflects the determination based on the scanning direction body shape distribution function. Therefore, when the scanning bed moves to different scanning positions, the adaptive pitch of the normalized dose can be better calculated based on the pitch position function, and the noise difference problem caused by the difference in the distribution of the scanning model's body shape distribution along the scanning direction of the scanning bed can be better eliminated.

[0085] Based on the above embodiment, before executing step S130, the method further includes:

[0086] In response to receiving a scanning operation submitted by the target object, a positioning scanning image of the scanning phantom is obtained; scanning information is determined according to the positioning scanning image, wherein the scanning information includes a starting scanning position and an ending scanning position; and the scanning information is brought into a scanning direction body shape distribution function to determine an average equivalent diameter of the scanning phantom.

[0087] Specifically, by acquiring a positioning scan image, determining the starting scan position and the ending scan position based on the positioning scan image, and then solving the average value of the equivalent diameters of the scanning phantom at different scanning positions between the starting scan position and the ending scan position in the scanning direction of the scanning bed, the average equivalent diameter of the scanning phantom at the scanning angle is obtained.

[0088] Specifically, the average equivalent diameter of the scanned phantom at a certain scanning angle satisfies:

[0089]

[0090] The value range of z is from z0 to z, where z0 is the starting scanning position of the scanning bed and z is the ending scanning position of the scanning bed.

[0091] On the basis of the above embodiment, after the target tube current modulation dose and the target helical pitch are determined, during the scanning process of the CT scanning system, when the rotating gantry rotates to the target scanning angle and the scanning bed moves to the target scanning position, at this time, the tube current modulation dose of the CT scanning system is controlled to be the target tube current modulation dose at the target scanning position and the target scanning angle; and the helical pitch of the CT scanning system is controlled to be the target helical pitch at the target scanning position.

[0092] Based on the above embodiments, Figure 2 is a schematic diagram of the structure of a device for determining parameters of a CT scanning system provided by an embodiment of the present disclosure, such as Figure 2 As shown, the CT scanning system parameter determination device includes:

[0093] A distribution function construction module 210 is used to construct a body shape distribution function of the scanned phantom and a body shape distribution function in a scanning direction;

[0094] The preset parameter information acquisition module 220 is used to acquire the preset parameter information of the CT scanning system, wherein the preset parameter information includes a preset scanning phantom equivalent diameter, a preset pitch reference parameter, a preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, a scanning gantry rotation period, a water linear attenuation coefficient, and a body shape differentiation adjustment factor;

[0095] The tube current modulation dose function determination module 230 is used to determine the tube current modulation dose function according to a preset scanning phantom equivalent diameter, a preset pitch reference parameter, a preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, a scanning gantry rotation period, a linear attenuation coefficient of water, a body shape difference adjustment factor, a body shape distribution function, and a scanning direction body shape distribution function;

[0096] The pitch position function determination module 240 is used to determine the pitch position function according to the preset pitch reference parameter, the linear attenuation coefficient of water and the body shape distribution function in the scanning direction;

[0097] The target parameter determination module 250 is used to determine a target tube current modulation dose and a target pitch at a target scanning angle and a target scanning position according to the tube current modulation dose function and the pitch position function.

[0098] The CT scanning system parameter determination device provided by the embodiment of the present disclosure first constructs a body shape distribution function of a scanning phantom and a body shape distribution function in a scanning direction; then obtains preset parameter information of the CT scanning system; and then determines a tube current modulation dose function according to a preset scanning phantom equivalent diameter, a preset pitch reference parameter, a preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, a scanning gantry rotation period, a linear attenuation coefficient of water, a body shape differentiation adjustment factor, a body shape distribution function and a scanning direction body shape distribution function; and determines a pitch position function according to the preset pitch reference parameter, the linear attenuation coefficient of water and the scanning direction body shape distribution function; finally, determines a target tube current modulation dose and a target pitch at a target scanning angle and a target scanning position according to the tube current modulation dose function and the pitch position function. That is, the target tube current modulation dose at the target scanning angle and the target scanning position is determined by the tube current modulation dose function, and the target pitch at the target scanning position is determined based on the pitch position function, and the tube current modulation dose function is determined based on the body shape distribution function and the scanning direction body shape distribution function. Therefore, the tube current modulation dose function can better reflect the body shape distribution of the scanning model at different scanning positions and scanning angles. When the scanning bed moves to different scanning positions and scanning angles, the adaptive tube current modulation dose of the normalized dose can be better calculated based on the tube current modulation dose function, and the pitch position function reflects the determination based on the scanning direction body shape distribution function. Therefore, when the scanning bed moves to different scanning positions, the adaptive pitch of the normalized dose can be better calculated based on the pitch position function, and the noise difference problem caused by the difference in the distribution of the scanning model's body shape distribution along the scanning direction of the scanning bed can be better eliminated.

[0099] In a specific implementation, the body shape distribution position function satisfies:

[0100]

[0101] The body shape distribution function in the scanning direction satisfies:

[0102]

[0103] Where z is the scanning position of the scanning bed, θ is the rotation angle of the scanning gantry, and D l (z) is the equivalent long axis information of the scanned phantom when the scanning position of the scanning bed is z in the scanning direction of the scanning bed, D s(z) is the equivalent short-axis information of the scanning phantom when the scanning position of the scanning bed is z in the scanning direction of the scanning bed.

[0104] In a specific embodiment, the tube current modulation dose function satisfies:

[0105] mA(z,θ)=mAs ref *Pitch ref *exp[mu*(WED-WEDref)*Coe]*exp[mu*(width(z,θ)-WED(z))] / RT

[0106] Where z is the scanning position of the scanning bed, θ is the rotation angle of the scanning gantry, and WED ref Pitch is the preset equivalent diameter of the scanning model. ref is the preset pitch reference parameter, mAs ref is the preset current-time product under the preset scanning phantom equivalent diameter and preset pitch reference parameters, RT is the scanning gantry rotation period, mu is the linear attenuation coefficient of water, and Coe is the body shape difference adjustment factor.

[0107] In a specific embodiment, the pitch position function satisfies:

[0108]

[0109] Among them, Pitch ref is the preset pitch reference parameter, and mu is the linear attenuation coefficient of water.

[0110] In a specific implementation, before determining the tube current modulation dose function according to the body shape distribution position function and the scanning direction body shape distribution function, the method further includes:

[0111] In response to receiving a scanning operation submitted by the target object, acquiring a positioning scanning image of the scanning phantom;

[0112] Determining scanning information according to the positioning scanning image, wherein the scanning information includes a starting scanning position and an ending scanning position;

[0113] The scanning information is introduced into the body shape distribution function in the scanning direction to determine the average equivalent diameter of the scanned phantom.

[0114] In a specific embodiment, determining a target tube current modulation dose and a target pitch at a target scanning angle and a target scanning position according to the tube current modulation dose function and the pitch position function comprises:

[0115] Obtaining a target scanning angle of a scanning gantry and a target scanning position of a scanning bed;

[0116] Substituting the target scanning angle and the target scanning position into the tube current modulation dose function, the target tube current modulation dose at the target scanning angle and the target scanning position is obtained;

[0117] The target scanning position is brought into the pitch position function to obtain the target pitch at the target scanning position.

[0118] In a specific embodiment, the device further comprises:

[0119] Controlling the tube current modulation dose of the CT scanning system to be a target tube current modulation dose at a target scanning position and a target scanning angle;

[0120] The pitch of the CT scanning system is controlled to be the target pitch at the target scanning position.

[0121] The present application also provides a computer device. Figure 3 , Figure 3 This is a basic structural block diagram of the computer device in this embodiment.

[0122] The computer device includes a memory 510 and a processor 520 that are connected to each other through a system bus. It should be noted that the figure only shows a computer device with components 510-520, but it should be understood that it is not required to implement all the components shown, and more or fewer components can be implemented instead. Among them, those skilled in the art can understand that the computer device here is a device that can automatically perform numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes but is not limited to microprocessors, application specific integrated circuits (Application Specific Integrated Circuit, ASIC), programmable gate arrays (Field-Programmable Gate Array, FPGA), digital processors (Digital Signal Processor, DSP), embedded devices, etc.

[0123] Computer devices can be computing devices such as desktop computers, notebooks, PDAs, and cloud servers. Computer devices can interact with users through keyboards, mice, remote controls, touch pads, or voice control devices.

[0124] The memory 510 includes at least one type of readable storage medium, and the readable storage medium includes a non-volatile memory or a volatile memory, such as a flash memory, a hard disk, a multimedia card, a card-type memory (e.g., SD or DX memory, etc.), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, etc., and the RAM may include a static RAM or a dynamic RAM. In some embodiments, the memory 510 may be an internal storage unit of a computer device, such as a hard disk or a memory of the computer device. In other embodiments, the memory 510 may also be an external storage device of a computer device, such as a plug-in hard disk, a smart memory card (SMC), a secure digital (SD) card, or a flash card (Flash Card), etc., equipped on the computer device. Of course, the memory 510 may also include both an internal storage unit of the computer device and an external storage device thereof. In this embodiment, the memory 510 is generally used to store an operating system and various application software installed on the computer device, such as the program code of the above method, etc. In addition, the memory 510 may also be used to temporarily store various data that have been output or are to be output.

[0125] The processor 520 is generally used to perform the overall operation of the computer device. In this embodiment, the memory 510 is used to store program codes or instructions, the program code includes computer operation instructions, and the processor 520 is used to execute the program codes or instructions stored in the memory 510 or process data, such as running the program code of the above method.

[0126] In this article, the bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus system can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0127] Another embodiment of the present application also provides a computer-readable medium, which may be a computer-readable signal medium or a computer-readable medium. A processor in a computer reads a computer-readable program code stored in the computer-readable medium, so that the processor can execute the functional actions specified in each step or a combination of steps in the above method; and generate a device for implementing the functional actions specified in each block or a combination of blocks in the block diagram.

[0128] Computer-readable media include but are not limited to electronic, magnetic, optical, electromagnetic, infrared memory or semiconductor systems, devices or apparatuses, or any appropriate combination of the foregoing, the memory is used to store program codes or instructions, the program codes include computer operating instructions, and the processor is used to execute the program codes or instructions of the above methods stored in the memory.

[0129] For the definitions of memory and processor, please refer to the description of the aforementioned computer device embodiment and will not be repeated here.

[0130] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0131] Each functional unit or module in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0132] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program code.

[0133] Unless the context clearly indicates otherwise, the singular form of the words used herein and in the appended claims includes the plural and vice versa. Thus, when referring to the singular, the plural form of the corresponding term is generally included. Similarly, the words "comprise" and "include" are to be interpreted as inclusive rather than exclusive. Likewise, the terms "include" and "or" should be interpreted as inclusive unless such interpretation is expressly prohibited herein. Where the term "example" is used herein, particularly when it is located after a group of terms, the "example" is merely exemplary and illustrative and should not be considered exclusive or comprehensive.

[0134] Further aspects and scopes of adaptability become apparent from the description provided herein. It should be understood that various aspects of the present application can be implemented individually or in combination with one or more other aspects. It should also be understood that the description and specific embodiments herein are intended for purposes of illustration only and are not intended to limit the scope of the present application.

[0135] Several embodiments of the present disclosure are described in detail above, but it is obvious that those skilled in the art can make various modifications and variations to the embodiments of the present disclosure without departing from the spirit and scope of the present disclosure. The protection scope of the present disclosure is defined by the attached claims.

Claims

1. A method for determining parameters of a CT scanning system, characterized in that: include: Constructing the body shape distribution function of the scanning model and the body shape distribution function of the scanning direction; Acquiring preset parameter information of the CT scanning system, wherein the preset parameter information includes a preset scanning phantom equivalent diameter, a preset pitch reference parameter, a preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, a scanning gantry rotation period, a linear attenuation coefficient of water, and a body shape differentiation adjustment factor; Determine a tube current modulation dose function according to the preset scanning phantom equivalent diameter, the preset pitch reference parameter, the preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, the scanning gantry rotation period, the linear attenuation coefficient of water, the body shape difference adjustment factor, the body shape distribution function and the scanning direction body shape distribution function; Determining a pitch position function according to the preset pitch reference parameter, the linear attenuation coefficient of water and the scanning direction body shape distribution function; Determining a target tube current modulation dose and a target pitch at a target scanning angle and a target scanning position according to the tube current modulation dose function and the pitch position function; The step of determining a target tube current modulation dose and a target pitch at a target scanning angle and a target scanning position according to the tube current modulation dose function and the pitch position function comprises: Obtaining a target scanning angle of a scanning gantry and a target scanning position of a scanning bed; Substituting the target scanning angle and the target scanning position into the tube current modulation dose function to obtain a target tube current modulation dose at the target scanning angle and the target scanning position; The target scanning position is brought into the pitch position function to obtain the target pitch at the target scanning position.

2. The method according to claim 1, characterized in that The body size distribution function satisfies: The scanning direction body shape distribution function satisfies: Where z is the scanning position of the scanning bed, θ is the rotation angle of the scanning gantry, and D l (z) is the equivalent long axis information of the scanned phantom when the scanning position of the scanning bed is z in the scanning direction of the scanning bed, D s (z) is the equivalent short-axis information of the scanning phantom when the scanning position of the scanning bed is z in the scanning direction of the scanning bed.

3. The method according to claim 2, characterized in that The tube current modulation dose function satisfies: mA(z,θ)=mAs ref *Pitch ref *exp[mu*(WED-WED ref )*Coe]*exp[mu*(width(z,θ)-WED(z))] / RT Where z is the scanning position of the scanning bed, θ is the rotation angle of the scanning gantry, and WED ref Pitch is the preset equivalent diameter of the scanning model. ref is the preset pitch reference parameter, mAs ref is the preset current-time product under the preset scanning phantom equivalent diameter and preset pitch reference parameters, RT is the scanning gantry rotation period, mu is the linear attenuation coefficient of water, Coe is the body shape differentiation adjustment factor, WED is the average equivalent diameter of the scanning phantom when the scanning gantry rotation angle is θ, and WED(z) is the scanning direction body shape distribution function when the scanning gantry rotation angle is θ.

4. The method according to claim 2, characterized in that: The pitch position function satisfies: Among them, Pitch ref is the preset pitch reference parameter, mu is the linear attenuation coefficient of water, WED is the average equivalent diameter of the scanning phantom when the scanning gantry rotates at an angle of θ, and WED(z) is the body shape distribution function in the scanning direction when the scanning gantry rotates at an angle of θ.

5. The method according to claim 1, characterized in that Before determining the tube current modulation dose function according to the preset scanning phantom equivalent diameter, the preset pitch reference parameter, the preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, the scanning gantry rotation period, the linear attenuation coefficient of water, the body shape difference adjustment factor, the body shape distribution function and the scanning direction body shape distribution function, the method further includes: In response to receiving a scanning operation submitted by the target object, acquiring a positioning scanning image of the scanning phantom; Determining scanning information according to the positioning scanning image, wherein the scanning information includes a starting scanning position and an ending scanning position; The scanning information is introduced into the scanning direction body shape distribution function to determine the average equivalent diameter of the scanning phantom.

6. The method according to claim 1, characterized in that The method further comprises: Controlling the tube current modulation dose of the CT scanning system to be the target tube current modulation dose at the target scanning position and the target scanning angle; The pitch of the CT scanning system is controlled to be the target pitch at the target scanning position.

7. A device for determining parameters of a CT scanning system, characterized in that: include: A distribution function construction module is used to construct a body shape distribution function of the scanning model and a body shape distribution function in the scanning direction; A preset parameter information acquisition module, used to acquire preset parameter information of a CT scanning system, wherein the preset parameter information includes a preset scanning phantom equivalent diameter, a preset pitch reference parameter, a preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, a scanning gantry rotation period, a linear attenuation coefficient of water, and a body shape differentiation adjustment factor; a tube current modulation dose function determination module, configured to determine a tube current modulation dose function according to the preset scanning phantom equivalent diameter, the preset pitch reference parameter, the preset current-time product under the preset scanning phantom equivalent diameter and the preset pitch reference parameter, the scanning gantry rotation period, the linear attenuation coefficient of water, the body shape difference adjustment factor, the body shape distribution function and the scanning direction body shape distribution function; A pitch position function determination module, used to determine the pitch position function according to the preset pitch reference parameter, the linear attenuation coefficient of the water and the body shape distribution function in the scanning direction; a target parameter determination module, used to determine a target tube current modulation dose and a target pitch at a target scanning angle and a target scanning position according to the tube current modulation dose function and the pitch position function; The step of determining a target tube current modulation dose and a target pitch at a target scanning angle and a target scanning position according to the tube current modulation dose function and the pitch position function comprises: Obtaining a target scanning angle of a scanning gantry and a target scanning position of a scanning bed; Substituting the target scanning angle and the target scanning position into the tube current modulation dose function to obtain a target tube current modulation dose at the target scanning angle and the target scanning position; The target scanning position is brought into the pitch position function to obtain the target pitch at the target scanning position.

8. A computer device, characterized in that: include: one or more processors; a storage device for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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